/Engine/Source/Runtime/Engine/Classes/Engine/World.h
Sets NumLightingUnbuiltObjects to the specified value. Marks the worldsettings package dirty if the value changed.
Sets bMapNeedsLightingFullyRebuild to the specified value. Marks the worldsettings package dirty if the value changed.
void SetMapNeedsLightingFullyRebuilt ( int32 InNumLightingUnbuiltObjects, int32 InNumUnbuiltReflectionCaptures )